function onLoad() {
	selectBanner();
}

function selectBanner() {
	var maxBanner = 3;
	var bannerId = Math.floor(Math.random()*maxBanner) + 1;
	
	document.getElementById('header').style.backgroundImage = "url(../images/banner_" + bannerId + ".jpg)";
}

function formFocus(id) {
	document.getElementById(id).focus();
}

function highlight(field, titleId) {
	document.getElementById(titleId).style.color = "#00529F";
	field.style.backgroundColor = "#FFFEC9";
}

function unhighlight(field, titleId) {
	document.getElementById(titleId).style.color = "#000000";	
	field.style.backgroundColor = "#FFFFFF";
}